Sergeant Tashigi is a Naval officer serving under Commodore Smoker. She is first introduced, at the rank of Master CPO, when the Straw Hat Pirates dock in Loguetown. While adept at sword fighting, she is unusually clumsy, almost stabbing herself accidentally with her own sword on one occasion. She is also very well-versed in the famous katana of One Piece, knowing their names and origins. Tashigi wields Shigure, a Wazamono sword.

Tashigi's stated goal is to remove all Meitō ,named swords with prestigious histories, from the hands of those who would use them for their own ends. After meeting Roronoa Zoro she set out to sea with Smoker, chasing after him and the rest of the Straw Hat crew. She bears a striking resemblance to Kuina, Zoro's deceased childhood friend.